{"id":18309,"date":"2026-09-24T00:19:32","date_gmt":"2026-09-23T22:19:32","guid":{"rendered":"https:\/\/www.badania-medyczne.pl\/full-blood-count-results-explained\/"},"modified":"2026-10-20T11:33:04","modified_gmt":"2026-10-20T09:33:04","slug":"full-blood-count-results-explained","status":"publish","type":"post","link":"https:\/\/www.badania-medyczne.pl\/en\/full-blood-count-results-explained\/","title":{"rendered":"Full Blood Count: How to Interpret Results (MCV, MCH, RDW, Differential and Platelets)"},"content":{"rendered":"

A full blood count (FBC) is the most frequently performed laboratory test worldwide and is usually one of the first tests a doctor requests. A single report contains numerous parameters identified by abbreviations: RBC, HGB, HCT, MCV, MCH, MCHC, RDW, WBC, PLT and MPV. Most patients focus only on the arrows marking results outside the reference range. However, the real value of a full blood count lies in understanding how these parameters relate to one another. This practical guide explains what each abbreviation means, which combinations of results are typical of common medical conditions and when a flagged result may not be significant. Final interpretation should always be carried out by a doctor.<\/p>\n

Red blood cells: transporting oxygen<\/h2>\n

RBC, HGB, HCT<\/h3>\n

RBC<\/strong> (red blood cell count) indicates the number of red blood cells, or erythrocytes, per microlitre of blood. HGB<\/strong> (haemoglobin) measures the amount of oxygen-carrying protein in the blood. It is the most important individual parameter used to diagnose anaemia (approximately below 12 g\/dl in adult women and below 13 g\/dl in adult men; reference ranges vary between laboratories). HCT<\/strong> (haematocrit) represents the percentage of blood volume occupied by red blood cells. It increases with dehydration and decreases in anaemia.<\/p>\n

MCV: red blood cell size<\/h3>\n

Mean corpuscular volume is a key parameter in classifying anaemia. Low MCV<\/strong> (microcytosis) most commonly indicates iron deficiency, and less frequently thalassaemia or anaemia of chronic disease. High MCV<\/strong> (macrocytosis) may indicate vitamin B12 or folate deficiency, liver disease, hypothyroidism, excessive alcohol consumption or medication effects. Normal MCV<\/strong> in someone with anaemia may suggest acute blood loss, kidney disease, inflammation or two simultaneous nutritional deficiencies.<\/p>\n

MCH and MCHC: haemoglobin content of red blood cells<\/h3>\n

MCH is the mean mass of haemoglobin in an individual red blood cell, while MCHC represents its concentration. Both decrease in iron deficiency (red blood cells become small and pale, a condition known as hypochromia). Elevated MCHC is uncommon and may indicate spherocytosis or an analytical error, such as red blood cell agglutination at low temperatures.<\/p>\n

RDW: variation in red blood cell size<\/h3>\n

Red cell distribution width (RDW) indicates how much red blood cells vary in size. It increases early in iron deficiency, as the bone marrow produces progressively smaller cells alongside older, normal-sized cells, even before haemoglobin levels fall. High RDW with normal MCV may indicate combined iron and vitamin B12 deficiency. Normal RDW with low MCV is more suggestive of thalassaemia than iron deficiency.<\/p>\n

Reticulocytes<\/h3>\n

Reticulocytes are immature red blood cells and are not always included in a standard full blood count. A high reticulocyte count indicates increased bone marrow activity (following bleeding, during haemolysis or at the start of iron treatment). A low reticulocyte count in someone with anaemia suggests impaired red blood cell production, potentially caused by nutritional deficiencies or bone marrow or kidney disease.<\/p>\n

White blood cells: immune defence<\/h2>\n

WBC and white blood cell differential<\/h3>\n

The total white blood cell count provides limited information without a differential, which divides white blood cells into five types: neutrophils, lymphocytes, monocytes, eosinophils and basophils. An automated differential reports both their percentages and absolute counts. The absolute count<\/strong> is generally more important for interpretation because percentages depend on the proportions of the other white blood cell types.<\/p>\n