Packed Cell Volume (PCV) in Dehradun

What is a Packed Cell Volume (PCV)?

Packed cell volume, also called haematocrit, is the percentage of your blood volume made up of red cells. It is one of the three related measures, with haemoglobin and the red cell count, that describe oxygen-carrying capacity, and it usually runs at roughly three times the haemoglobin value. Because it is a proportion rather than an absolute quantity, it is affected by plasma volume as well as by red cells, and that dual sensitivity is what gives it a distinctive clinical use. In dehydration the plasma volume falls and the PCV rises even though the number of red cells has not changed, so a high reading in an unwell patient often reflects fluid loss rather than overproduction. The reverse is equally important: in dengue, plasma leaks out of blood vessels during the critical phase and the PCV rises sharply, and a rising haematocrit alongside a falling platelet count is one of the clearest warning signs of significant plasma leak. For that reason, in a dengue-endemic monsoon setting like Dehradun, the PCV is not a routine number but a monitored one.

Why take this test?

PCV is advised as part of a Complete Blood Count in the assessment of tiredness, breathlessness, palpitations or pallor, where a low value confirms anaemia. It is monitored serially in dengue and other conditions causing plasma leak, where the trend rather than any single value guides management and a rising haematocrit prompts closer attention. It is used in assessing dehydration and fluid status, in burns, and in conditions causing genuinely increased red cell production such as chronic lung disease, sleep apnoea and living at altitude. It is checked before surgery and in blood donors. It is rarely ordered alone, since it comes within a Complete Blood Count together with haemoglobin, red cell indices, white cells and platelets from the same sample, and in dengue in particular it is the pairing with the platelet count that carries the meaning.

• Part of a Complete Blood Count in suspected anaemia
• Serial monitoring in dengue, alongside the platelet count
• Assessing dehydration or fluid status
• Chronic lung disease, sleep apnoea or living at altitude
• Before surgery, and in blood donor assessment
• Burns or other conditions causing plasma loss

Normal reference ranges

Ranges are indicative for adults. Your report carries the lab-specific reference range and is reviewed by a LabONE pathologist; always interpret results with your doctor.

FAQs: Packed Cell Volume (PCV) in Dehradun