Mid-Luteal Draw
Blood collection timing approximately 7 days after ovulation to assess peak progesterone production during the luteal phase.
Full Definition
Mid-luteal draw refers to the strategic timing of blood collection during the middle of the luteal phase, typically 7 days post-ovulation or 7 days before expected menstruation. This timing captures peak progesterone production by the corpus luteum and is considered optimal for confirming ovulation and assessing luteal function. The mid-luteal draw is particularly important in fertility evaluations, as progesterone levels at this time should exceed 3 ng/mL (9.5 nmol/L) to indicate adequate ovulatory function. Accurate timing requires knowledge of the patient's ovulation date, cycle length, or use of ovulation prediction methods.
Usage
Usage note: Distinguish from day 21 draw, which assumes a 28-day cycle and may not correspond to true mid-luteal timing.
In Context
- "The mid-luteal draw revealed progesterone levels of 12.3 ng/mL, confirming robust ovulation." — Fertility clinic report
- "Patient education emphasized the importance of accurate timing for the mid-luteal draw." — Pre-collection instructions