What is the FT3 reference range for females?

• A. 210-440 pg/dL
• B. 80-200 pg/dL
• C. 300-500 pg/dL
• D. 100-300 pg/dL

Answer: (A)

Free T3 represents the active thyroid hormone in the blood, and its normal level in adults sits around 2.1 to 4.4 picograms per milliliter. When you express that same range in the units used on many labs, which is picograms per deciliter, it becomes approximately 210 to 440 pg/dL (since 2.1–4.4 pg/mL × 100 equals 210–440 pg/dL). For females, this roughly 210–440 pg/dL window is the typical reference interval.

So the range 210–440 pg/dL aligns with the common adult female FT3 reference range. The other options fall outside the usual limits for FT3 in adults, either too low or too high for a normal reference interval.