Though these two methods are still in use in some settings of primary care and medical teachings, they are widely replaced in the majority of settings by an automated analyzer, where HCT reports get generated along with the complete blood count.Ĭopyright © 2022, StatPearls Publishing LLC. A normal adult male shows an HCT of 40% to 54% and a female shows 36% to 48%. Multiplying the ratio by 100 gives the accurate value, which is the accepted reporting style for HCT. As it is a ratio, it doesn’t have any unit. HCT calculation is by dividing the lengths of the packed RBC layer by the length of total cells and plasma. However, the principle of the test remains the same as the “macro-hematocrit” method. It is beneficial for patients from whom blood collection is difficult (e.g., pediatric patients/hypovolemia). It requires less quantity of blood as well as less time requirement for the testing procedure. This method has been succeeded by the “micro-hematocrit” method which uses a small capillary tube instead of a Wintrobe hematocrit tube. Normal Value Range Negative Pregnancy Adult: 35 to.
Hematocrit normal range series#
When a complete blood count (CBC) is ordered, hematocrit levels are included in the series of blood tests. Hematocrit levels represent red blood cell volume in the given blood sample. This method of determining HCT by Wintrobe hematocrit tube is known as the “macro-hematocrit” method.Ī Wintrobe tube is a narrow glass tube measuring 110-mm-long, with graduation from 0 to 100 mm in both ascending and descending order. When a complete blood count (CBC) is ordered, hematocrit levels are included in the series of blood tests. From below upwards, the layers are - a layer of red blood cells (RBC), a layer of white blood cells(WBC) and platelets, and a layer of plasma at the top. After centrifugation, the component of blood separates into three distinct parts. A glass tube and a centrifuge machine are sufficient to measure HCT. It is a simple test to identify conditions like anemia or polycythemia and also to monitor response to the treatment.
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Activated partial thromboplastin time Alanine aminotransferase (ALT, SGPT) Albumin Aldosterone Alkaline phosphatase Alpha-1-antitrypsin Alpha-fetoprotein Amylase Angiotensin converting enzyme Anion gap Antithrombin III, functional Apolipoprotein A-1. Home > Reference > Reference Values Hematocrit. Hence, it is also known and reported as a packed cell volume (PCV). Reference Values For Hematocrit in Pregnancy. The term "hematocrit (HCT)" originated from English “hemato-“ and Greek “krites.” HCT measures the volume of packed red blood cells (RBC) relative to whole blood.