Powered by


                    Home  |  Forums  |  Humor  |  Advertising  |  Contact
   Ask a Doctor

   News via RSS







   Forum Archives





















   Primary Care






   Other Sections


   Research Tools

   Medical Tutorials

   Medical Software






Hematocrit (HCT) or Packed Cell Volume (PCV)

Hematocrit or packed cell volume (PCV) - is the fraction of whole blood volume that consists of red blood cells.


After centrifugation, the height of the red cell column is measured and compared to the total height of the column of whole blood. The percentage of the total blood volume occupied by the red cell mass is the hematocrit. Hematocrit depends mostly on the number of RBCs but there is some effect (to a much lower extent) from the average size of the RBCs.

Reference values

Reference values are 42-52% for males and 36-48% for females. The hematocrit is usually about 3 times the hemoglobin value (assuming there is not marked hypochromia). The average error in hematocrit is about 1-2%. The hematocrit may be changed by altitude, position, and heavy smoking, in the same manner as the hemoglobin may be changed.

advertisement.gif (61x7 -- 0 bytes)

Are you a doctor or a nurse?

Do you want to join the Doctors Lounge online medical community?

Participate in editorial activities (publish, peer review, edit) and give a helping hand to the largest online community of patients.

Click on the link below to see the requirements:

Doctors Lounge Membership Application

previous.gif (72x17 -- 347 bytes) next.gif (72x17 -- 277 bytes)

 advertisement.gif (61x7 -- 0 bytes)



We subscribe to the HONcode principles of the HON Foundation. Click to verify.
We subscribe to the HONcode principles. Verify here

Privacy Statement | Terms & Conditions | Editorial Board | About us
Copyright 2001-2012 DoctorsLounge. All rights reserved.