Low blood calcium was linked to poorer sperm quality in a study of 1,230 men being checked for infertility. The men had blood tests, semen tests, and physical exams between 2017 and 2020. Researchers measured Corrected Calcium (Albumin-Adjusted) and ionized calcium, the free form in blood. They also measured Vitamin D (25-OH) and parathyroid hormone, which helps control Calcium levels. Men with three findings together had poorer semen quality: low free calcium, higher parathyroid hormone, and low vitamin D. They had fewer sperm, less sperm movement, and fewer normally shaped sperm. The study defined low free calcium as below 1.18 mmol/l. It used 4.9 pmol/l or higher for the higher hormone group. Men with vitamin D below 25 nmol/l had less sperm movement than those above 50 nmol/l. Fewer sperm moved forward, too. The source did not report how large these differences were. For this community, the type of calcium test matters. Free calcium had a stronger link with parathyroid hormone than the adjusted result did. These findings do not establish the adjusted result alone as a fertility marker. This study compared measurements without testing a treatment. It cannot show that low levels caused poorer sperm quality. It also cannot show whether Calcium Supplementation or Vitamin D Supplementation improves it. When comparing your numbers with the community, test names and units add useful context. Keeping related blood results and semen results together may make those conversations clearer. A single result cannot tell the whole story. What patterns have you noticed in your blood results alongside fertility testing?