Iron Total Mass Concentration (Serum/Plasma)

Why Might You Need This Test?

Your healthcare provider may order this test if you have symptoms like fatigue, pale skin, weakness, or unusual tiredness—common signs of low iron—or if you have conditions like anemia, frequent blood loss (e.g., heavy periods), or an increased risk of iron overload (e.g., genetic disorders). They might also check it if you’re planning pregnancy, have unexplained weight loss, or have certain digestive issues that could affect iron absorption.

What Does a Low or High Iron Level Mean?

Low iron levels may indicate iron deficiency, which can cause anemia and weaken your immune system. High levels could suggest iron overload, which may strain your organs over time. Your results will be interpreted in the context of your overall health and symptoms.

How Is This Test Done?

A small blood sample is drawn from a vein in your arm. The blood is then sent to a lab where it’s analyzed to measure the total iron concentration in your serum or plasma. The test typically takes a few hours to complete, and results are usually available within a few days.

What Should You Expect Before or After the Test?

Before the test, avoid taking iron supplements or certain medications (like multivitamins) that may contain iron for at least 24 hours before your appointment. After the test, you may experience mild bruising or soreness at the injection site, but this usually goes away quickly.