Why Should Cat Owners Care About High MCH and MCHC?
MCH (13-17 pg) represents the average amount of hemoglobin per red blood cell in picograms (pg). A high MCH suggests that each red blood cell contains more hemoglobin than normal, which can be indicative of macrocytic anemia or dehydration. Macrocytic anemia occurs when the body produces abnormally large red blood cells with a higher concentration of hemoglobin.
MCHC (32-35 g/dL) measures the average concentration of hemoglobin in a single red blood cell, expressed as grams per deciliter (g/dL). A raised MCHC is almost always an artefact rather than a disease: a red cell cannot be packed with more haemoglobin than it already holds. Haemolysis during collection, a lipaemic sample and agglutination all inflate the measured haemoglobin and push the calculated MCHC up.
Both high MCH and MCHC should be interpreted alongside other hematological parameters such as mean corpuscular volume (MCV) and red cell distribution width (RDW). For instance, a combination of elevated MCH and MCHC along with an increased MCV may suggest macrocytic anemia. Conversely, if the MCH is high but the MCHC is normal or low, it could indicate hypochromic anemia.
Further diagnostic tests such as reticulocyte count, iron studies (serum iron, ferritin), and bone marrow examination may be necessary to determine the exact cause of elevated MCH and MCHC levels. These additional tests help in identifying specific deficiencies or abnormalities that contribute to the hematological changes observed.
Given the potential implications of high MCH and MCHC values, it is essential for cat owners to consult a veterinarian if these markers are outside the normal reference range. Early intervention can prevent complications associated with anemia and other blood disorders.
What Are MCH and MCHC?
MCH (Mean Corpuscular Hemoglobin) is a measure of the average amount of hemoglobin in each red blood cell. It reflects the concentration of hemoglobin within individual erythrocytes, providing insight into the oxygen-carrying capacity of these cells. The normal reference range for MCH in cats is 13-17 pg.
MCHC (Mean Corpuscular Hemoglobin Concentration) indicates the average concentration of hemoglobin per unit volume of red blood cells. It helps assess the efficiency of hemoglobin within erythrocytes and can be useful in diagnosing various hematological disorders. The normal reference range for MCHC in cats is 32-35 g/dL.
Both MCH and MCHC are nonspecific markers that may indicate a variety of conditions affecting red blood cells, such as anemia or polycythemia. They should be interpreted alongside other hematological parameters like RBC count, hemoglobin concentration (HGB), and hematocrit (HCT) to provide a comprehensive picture of the animal’s health.
In clinical practice, MCH and MCHC values can help veterinarians identify underlying issues that may not be immediately apparent from other blood tests. For example, in cases where anemia is suspected but the RBC count is normal or elevated, evaluating MCH and MCHC can provide additional clues about the type of anemia present.
- Anemia: Conditions where MCH and MCHC may be low due to decreased hemoglobin content per cell. This can result from iron deficiency, chronic disease, or blood loss. For instance, in a cat with chronic kidney disease, MCH and MCHC levels might decrease as the body struggles to produce sufficient healthy red blood cells.
- Polycythemia: Situations where MCH and MCHC might be elevated because of an increased concentration of hemoglobin within red blood cells, often seen in cases of dehydration or erythropoietin overproduction. In a dehydrated cat, for example, the hematocrit (HCT) may rise due to reduced plasma volume, leading to higher MCH and MCHC values.
A veterinarian may consider further tests such as a complete blood count (CBC), reticulocyte count, iron studies, and bone marrow examination to determine the underlying cause when MCH and MCHC values are abnormal. Treatment would be determined based on the specific diagnosis made by the veterinarian.
Laboratory Reference Ranges for MCH and MCHC in Cats
The mean corpuscular hemoglobin (MCH) and mean corpuscular hemoglobin concentration (MCHC) are hematological parameters that provide information about the average amount of hemoglobin within a red blood cell. These values can indicate various conditions affecting erythropoiesis, such as anemia or polycythemia. Understanding these parameters is crucial for diagnosing underlying health issues in cats.
MCH measures the average mass of hemoglobin per red blood cell and is typically expressed in picograms (pg). The normal reference range for MCH in cats is 13-17 pg. A value below this range may suggest hypochromic anemia, where the cells are smaller than normal with less hemoglobin content. Conversely, a value above this range point at an artefact of the sample, or at primary polycythaemia. Hypochromic anemia can be further characterized by low MCV values and is often associated with iron deficiency.
MCHC measures the average concentration of hemoglobin within red blood cells and is typically expressed in grams per deciliter (g/dL). The normal reference range for MCHC in cats is 32-35 g/dL. A value below this range may suggest hypochromic anemia, where the cells are dilute with less concentrated hemoglobin. Conversely, a value above this range point at an artefact of the sample, or at primary polycythaemia. A high MCHC is an artefact rather than a disease: haemolysis, lipaemia and agglutination inflate the measured haemoglobin.
Both MCH and MCHC should be interpreted alongside other hematological parameters such as red blood cell count (RBC), hematocrit (HCT), and mean corpuscular volume (MCV) to provide a comprehensive understanding of the erythropoietic status. For instance, if an affected cat shows both low MCH and MCHC values along with a decreased RBC count and HCT, it may indicate severe iron deficiency or chronic blood loss leading to hypochromic microcytic anemia.
Further tests, including reticulocyte count, iron studies (such as serum iron levels, total iron-binding capacity, and ferritin), and bone marrow examination, may be necessary for definitive diagnosis. These additional diagnostic steps help in identifying the root cause of abnormal MCH and MCHC values, guiding appropriate treatment strategies.
| Parameter | Normal Range |
|---|---|
| MCH (pg) | 13-17 pg |
| MCHC (g/dL) | 32-35 g/dL |
What Causes High MCH and MCHC in Cats?
MCH (mean corpuscular hemoglobin) and MCHC (mean corpuscular hemoglobin concentration) are hematological parameters that provide information about the average amount of hemoglobin within a red blood cell. Elevated levels of both MCH and MCHC can indicate macrocytic anemia, where red blood cells are larger than normal due to increased hemoglobin content.
High MCH and MCHC in cats may be associated with several conditions:
- Regenerative response (reticulocytosis): Cobalamin is essential for the production of healthy red blood cells. A deficiency can lead to macrocytic anemia, characterized by large red blood cells.
- Folic acid deficiency: Similar to cobalamin deficiency, a lack of folic acid can result in impaired DNA synthesis and cause macrocytic changes in red blood cells.
- Hypothyroidism: Reduced thyroid hormone levels can affect bone marrow function, leading to the production of larger, less mature red blood cells.
- Chronic inflammation or infection: Inflammatory cytokines can interfere with normal hematopoiesis and lead to macrocytic changes in erythrocytes.
- Hemolytic anemia: Conditions that cause premature destruction of red blood cells, such as immune-mediated hemolysis, may result in increased MCHC due to the release of hemoglobin into circulation.
It is important to note that high MCH and MCHC do not confirm a specific diagnosis on their own. These parameters should be interpreted alongside other hematological findings such as red blood cell count (RBC), mean corpuscular volume (MCV), reticulocyte count, and serum cobalamin levels.
Further tests that may be considered include:
- Blood smear examination to assess the morphology of erythrocytes
- a reticulocyte count to establish whether the marrow is responding
- Total T4 measurement for thyroid function assessment
- Inflammatory markers such as C-reactive protein (CRP) or serum amyloid A (SAA)
The veterinarian may then prescribe appropriate treatment based on the underlying cause, which could include vitamin supplementation, hormone replacement therapy, or addressing any inflammatory conditions.
| Cause | Mechanism | Typical Signs |
|---|---|---|
| Regenerative response | Impaired DNA synthesis and red blood cell production. | Weakness, pale mucous membranes, lethargy. |
| Folic Acid Deficiency | Interferes with DNA synthesis and cell division in the marrow. | Anemia, poor appetite, weight loss. |
| Hypothyroidism | Reduced thyroid hormone levels impair bone marrow function. | Weight gain, lethargy, hair loss. |
| Chronic Inflammation or Infection | Inflammatory cytokines interfere with normal hematopoiesis. | Fever, weight loss, enlarged lymph nodes. |
| Hemolytic Anemia | Premature destruction of red blood cells leads to increased MCHC. | Jaundice, dark urine, rapid heart rate. |
How Do MCH and MCHC Compare to Other Blood Parameters?
MCH (mean corpuscular hemoglobin) and MCHC (mean corpuscular hemoglobin concentration) are hematological parameters that provide information about the average amount of hemoglobin within a red blood cell. These markers help assess the health and function of erythrocytes, which can be indicative of various anemias or nutritional deficiencies. In clinical practice, veterinarians often use MCH and MCHC in conjunction with other hematological indices to gain a comprehensive understanding of a cat’s overall blood health.
MCH is measured in picograms (pg), while MCHC is expressed as grams per deciliter (g/dL). The normal reference range for MCH in cats is 13-17 pg, and the normal reference range for MCHC is 32-35 g/dL. Both parameters are typically evaluated alongside other hematological indices such as RBC count, hemoglobin concentration, hematocrit, mean corpuscular volume (MCV), and red cell distribution width (RDW). These additional markers provide a more detailed picture of the erythrocytes’ size, shape, and hemoglobin content.
Abnormalities in MCH or MCHC can indicate conditions like macrocytic anemia (where cells are larger than normal) or hypochromic anemia (where cells have less hemoglobin). For example, a low MCH accompanies iron deficiency, because iron is essential for haemoglobin synthesis. A high MCH is far more often a sample problem – haemolysis or lipaemia – than a disease of the red cell. In clinical settings, veterinarians often observe that cats with chronic kidney disease (CKD) can exhibit elevated MCHC levels due to concurrent inflammatory processes.
It is important for veterinary practitioners to consider the context in which these parameters are evaluated. For instance, a cat presenting with signs of lethargy and pale mucous membranes might have anemia as part of its clinical picture. In such cases, evaluating MCH and MCHC alongside other hematological indices can help differentiate between various types of anemias and guide appropriate treatment strategies.
| Parameter | Normal Range |
|---|---|
| MCH (pg) | 13-17 pg |
| MCHC (g/dL) | 32-35 g/dL |
How Should High MCH and MCHC Be Interpreted?
MCH (mean corpuscular hemoglobin) and MCHC (mean corpuscular hemoglobin concentration) are hematological parameters that provide information about the average amount of hemoglobin within a red blood cell. Elevated levels of both MCH and MCHC in cats suggest macrocytic anemia, where the red blood cells are larger than normal and contain more hemoglobin per cell.
High MCH (13-17 pg) and high MCHC (32-35 g/dL) is most often explained by the sample itself – haemolysis, lipaemia or agglutination – and only then by a genuine change in the red cells. These markers do not confirm a specific diagnosis on their own but should be interpreted alongside other hematological parameters and clinical signs.
Further tests usually start with a blood smear and a reticulocyte count, because in cats macrocytosis most often means the marrow is regenerating; retroviral testing belongs on the list, and a marrow sample is reserved for cases where the count is not regenerative. The treatment will depend on identifying the specific condition causing these abnormalities.
| Finding | What it may suggest | Suggested next step |
|---|---|---|
| Above the reference range for both MCH and MCHC | macrocytosis, which in dogs and cats reflects a regenerating marrowtosis. | Further diagnostic tests such as CBC, reticulocyte count, a blood smear, a reticulocyte count and a full chemistry panel to determine the underlying cause. |
Macrocytic anemia can be caused by various factors including nutritional deficiencies, endocrine disorders, or hematological conditions. Elevated MCH and MCHC indicate that red blood cells are larger than normal and contain more hemoglobin per cell. This finding should prompt further investigation to identify the underlying cause.
In dogs and cats macrocytosis reflects immature red cells released by a regenerating marrow; they are larger than mature ones. Hypothyroidism may also contribute to macrocytosis due to reduced thyroid hormone levels affecting bone marrow function. Liver disease can impair the production of clotting factors and other proteins necessary for normal red blood cell formation.
It is important to conduct a thorough evaluation including complete blood count (CBC), reticulocyte count, a blood smear, a reticulocyte count and a full chemistry panel. These tests will help determine the specific cause of macrocytic anemia and guide appropriate treatment.
Are There Breed or Age Differences for High MCH and MCHC?
MCH (mean corpuscular hemoglobin) and MCHC (mean corpuscular hemoglobin concentration) are hematological parameters that reflect the average amount of hemoglobin within a red blood cell. In cats, there is no strong evidence to suggest breed-specific differences in normal ranges for these markers. However, certain conditions or diseases may affect these values differently across various age groups and health statuses.
High MCH and high MCHC can indicate macrocytic anemia, where the red blood cells are larger than normal due to increased hemoglobin content per cell. This condition is often associated with nutritional deficiencies such as a regenerative response, which can affect hematopoiesis in any cat regardless of breed.
Age-related changes may influence these parameters indirectly through underlying health conditions that become more prevalent with age. For example, chronic kidney disease (CKD) is more common in older cats and can lead to anemia due to reduced erythropoietin production or other factors affecting red blood cell production. In such cases, MCH and MCHC may be elevated as part of a compensatory mechanism.
Additionally, younger cats might experience high MCH and MCHC levels if they suffer from congenital conditions that affect hematopoiesis. For instance, certain genetic disorders or developmental issues can lead to macrocytic anemia in kittens. These cases highlight the importance of considering age-specific health risks when interpreting these parameters.
It is also important to note that while breed differences are not a significant factor for MCH and MCHC levels, individual cats may have unique genetic predispositions or environmental exposures that influence their hematological profiles. For example, some breeds might be more prone to certain nutritional deficiencies due to dietary preferences or metabolic needs.
When evaluating high MCH and MCHC in a cat, it is crucial to consider the overall clinical context, including age-related health issues and potential underlying conditions such as CKD or nutritional deficiencies. A comprehensive approach that includes thorough history taking, physical examination, and appropriate diagnostic testing can help identify the root cause of these hematological abnormalities.
| Parameter | Normal Range |
|---|---|
| MCH (pg) | 13-17 pg |
| MCHC (g/dL) | 32-35 g/dL |
What Is the Treatment Approach for High MCH and MCHC?
The mean corpuscular hemoglobin concentration (MCHC) and mean corpuscular hemoglobin (MCH) are hematological parameters that provide information about the average amount of hemoglobin within a red blood cell. Elevated levels of both MCH and MCHC in cats can indicate several underlying conditions, such as macrocytic anemia or erythropoietic disorders.
High MCH and MCHC values typically suggest larger-than-normal red blood cells (macrocytes) with higher hemoglobin content per cell. This pattern may be associated with nutritional deficiencies like iron deficiency or Regenerative response:, which can lead to ineffective erythropoiesis. Additionally, certain genetic disorders or chronic inflammatory conditions might also cause macrocytic changes in the red blood cells.
When interpreting high MCH and MCHC values, it is crucial to consider other hematological parameters such as mean corpuscular volume (MCV), reticulocyte count, and serum iron levels. These additional tests help differentiate between various causes of macrocytosis and guide appropriate treatment strategies.
- Iron Deficiency Anemia: If iron deficiency is suspected based on low ferritin or transferrin saturation levels, the veterinarian may prescribe oral iron supplements to correct the deficiency.
- Regenerative response: Where the marrow is regenerating, treatment addresses the underlying blood loss or destruction. The exact dose and frequency will be determined by the attending veterinarian based on clinical assessment and laboratory results.
- Inflammatory Conditions: Chronic inflammation can lead to macrocytic changes due to increased production of immature red blood cells (reticulocytes). Treatment may involve addressing the underlying inflammatory condition, which could include anti-inflammatory medications or corticosteroids as prescribed by a veterinarian.
The choice and method of treatment are decided by the attending veterinarian for each individual case. Early veterinary evaluation is essential to accurately diagnose the cause of high MCH and MCHC values and initiate appropriate management strategies.
Summary of Key Points About High MCH and MCHC in Cats
The mean corpuscular hemoglobin concentration (MCHC) is a measure of the average amount of hemoglobin per red blood cell, expressed as a percentage. A high MCHC value indicates that the hemoglobin content within each red blood cell is higher than normal, which can be associated with various hematological conditions in cats.
The reference range for MCHC in cats is 32-35 g/dL. Elevated levels of MCHC may indicate several underlying issues such as macrocytic anemia, where the red blood cells are larger and contain more hemoglobin than normal. in dogs and cats this pattern reflects a regenerating marrow rather than a nutritional deficiency.
High MCHC values should also be interpreted alongside other hematological parameters such as mean corpuscular volume (MCV) and mean corpuscular hemoglobin (MCH). For instance, a high MCHC with normal or elevated MCV suggests macrocytic anemia. Conversely, if the MCHC is high but the MCV is low, it may indicate microcytic anemia, which can be associated with conditions like chronic inflammation or lead poisoning.
Further diagnostic tests such as a complete blood count (CBC), reticulocyte count, and iron studies are often necessary to determine the exact cause of elevated MCHC levels. These tests help in identifying whether there is an underlying nutritional deficiency, hemolytic disease, or other hematological disorders that require specific treatment.
The veterinarian may then prescribe appropriate treatments based on the diagnosis, such as iron supplements for iron-deficiency anemia or addressing any chronic inflammatory conditions contributing to microcytic anemia. It is important to note that the exact dose and method of administration are determined by the attending veterinarian after a thorough evaluation of the cat’s condition.
Frequently Asked Questions
What do high MCH and MCHC levels together mean in my cat’s blood work?
High MCH and MCHC values often indicate that there might be issues with how the sample was handled before testing, such as hemolysis or lipemia. These conditions can artificially inflate the measurements.
Can high MCH and MCHC levels suggest anything specific about my cat’s health condition?
While high MCH and MCHC typically point to sample handling problems like hemolysis or lipemia, they rarely reflect actual physiological changes in your cat unless confirmed by further tests.
How should I interpret low MCH and MCHC results on my cat’s report?
Low MCH and MCHC usually signal iron deficiency anemia, where the body lacks sufficient iron to produce healthy red blood cells, leading to smaller and paler cells.
Are there other signs besides abnormal MCH and MCHC readings that could indicate iron deficiency in my cat?
Yes, symptoms of iron deficiency include pale gums, lethargy, poor appetite, and weakness. A veterinarian may also check for microcytic red blood cells under a microscope.
Why would my vet recommend checking both MCH and MCHC if one indicates a problem?
Checking both helps rule out artifacts due to sample mishandling. If only one is off but no physical evidence supports pathology, it likely means the sample needs retesting.
If my cat has high MCH and MCHC, what steps should we take next?
Your vet will probably repeat the test using fresh samples to ensure accuracy. They may also look at other markers like reticulocyte count and serum iron level to confirm any suspected issues.
Could dehydration affect my cat’s MCH and MCHC levels?
Dehydration does not directly impact MCH and MCHC; however, it affects hematocrit and hemoglobin concentration indirectly through hemoconcentration, which might confuse these indices.
Is it normal for MCH and MCHC levels to fluctuate slightly between different lab reports?
Small variations are common due to differences in equipment and methods used by labs. However, significant deviations from reference ranges warrant investigation into possible underlying causes.
What additional tests might be necessary if my cat’s MCH and MCHC levels are consistently abnormal?
Further testing could involve reticulocyte counts, bone marrow examination, and iron studies such as ferritin and transferrin saturation to better understand the cause behind the abnormalities.
Can certain medications influence my cat’s MCH and MCHC values?
Medications typically do not directly alter MCH or MCHC values. However, they can indirectly affect them via side effects like gastrointestinal bleeding, which leads to iron deficiency anemia.
Sources & Further Reading
This article draws on the following authoritative veterinary references. For your pet’s individual case, consult a licensed veterinarian.
- Merck Veterinary Manual — comprehensive clinical reference for veterinary practice
- AAFP Feline Guidelines — American Association of Feline Practitioners
Cite this articleMarcin Siedlecki. High MCH and MCHC Together in Cats – Combined Patterns. VetBlood, 2026. https://vetblood.io/blog/high-mch-and-mchc-together-in-cats-combined-patterns/Feel free to quote or reference this article, in whole or in part, with attribution and a link back.