📋 Reference sheet · Blood count and clotting

Low haemoglobin: MCV, reticulocytes and the haemolysis screen

Low haemoglobin. The mean cell volume (MCV) points the way, and the reticulocytes say whether the marrow is trying.

One page, every threshold with its number and unit. Reviewed and updated by practising UK GPs. Last reviewed 7 Oct 2026.

Paediatric values differ

This sheet puts the whole decision on one page: the thresholds that change what you do, each with its number and unit, and the sources each one was checked against.

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Inside the full sheet 🔒 Thresholds, numbers and units 🔒 Sources checked against the guideline

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Related Ocean Article: Assessment & Management of Anaemias · also Iron Deficiency Anaemia (IDA), Thalassaemia, Haematological Cancers (Leukaemia, Lymphoma, Multiple Myeloma), Sickle Cell Disease, Vitamin B12 and Folate Deficiency. Part of the GP reference sheets, result interpretation one page per test or finding.