Fertility Blood Markers

Total volume of ejaculate. Low volume may indicate obstruction, retrograde ejaculation, or hormonal insufficiency.

PED: AAS use suppresses gonadotropins (LH/FSH) which can reduce seminal fluid production from accessory glands. Volume may decrease on cycle but is typically the least affected semen parameter. HCG use on cycle helps maintain testicular contribution to volume. Recovery is usually relatively quick post-PCT compared to concentration and motility.

Number of spermatozoa per milliliter of ejaculate. WHO 6th edition lower reference limit is 16,000,000/mL (16 million/mL).

PED: CRITICAL: AAS cause profound suppression of spermatogenesis via HPT axis shutdown. FSH suppression removes the primary signal for Sertoli cells to support sperm development. Most AAS users become severely oligospermic (<5 million/mL) or azoospermic (zero sperm) within 2-3 months of cycle start. HCG maintains intratesticular testosterone but does not fully preserve spermatogenesis without FSH. Recovery post-PCT is highly variable: 6-12 months typical, but some users experience prolonged or incomplete recovery. Values near zero on cycle are expected and not alarming if temporary.

Percentage of sperm showing any movement (progressive + non-progressive). WHO 6th edition lower reference limit is 42%.

PED: Motility is severely impaired by AAS-induced hormonal disruption. Even residual sperm during AAS use often show poor motility due to disrupted epididymal maturation from low intratesticular testosterone. During recovery post-PCT, motility typically lags behind concentration recovery — sperm may return before quality does. HCG on cycle provides some protection. Values near zero on cycle are expected.

Percentage of sperm moving actively forward. WHO 6th edition lower reference limit is 30%. Most clinically relevant motility parameter for natural conception.

PED: Progressive motility is the most functionally important parameter for fertility — sperm must swim forward to reach the egg. AAS suppress this severely. During recovery, progressive motility is often the slowest parameter to normalise. A semen analysis showing adequate concentration but poor progressive motility still indicates impaired fertility. Monitor this marker closely during PCT and recovery if fertility is a goal.

Percentage of sperm with normal shape and structure (strict Kruger criteria). WHO lower reference limit is 4%.

PED: Morphology reflects the quality of spermatogenesis. AAS-disrupted hormonal milieu produces abnormal sperm forms (teratozoospermia). Even naturally, only a small percentage of sperm are morphologically normal — the 4% threshold is already low. During AAS use, morphology typically drops below this threshold. Recovery of normal morphology post-PCT can take 3+ months after concentration recovers, as it reflects a full spermatogenic cycle (~74 days). Persistently abnormal morphology after prolonged recovery may warrant fertility specialist referral.