Grifols Biomat USA San Marcos, TX

Donating at Grifols Biomat USA San Marcos, TX

Grifols Biomat USA San Marcos, TX is a Grifols donation center at 1400 I 35 Frontage Rd in San Marcos, TX. You can reach it on 512-392-7570. It opens seven days a week.

Who can donate here

Grifols asks that you are between 18 and 69 and you weigh at least 110 lb. You will also need photo ID, proof of your Social Security number, and proof of your current address. A tattoo or piercing in the last 4 months means waiting before you can donate.

When it is open

This location opens 7 days a week. Across the week the doors are open from 7am at the earliest to 6pm at the latest. Check the table above for the exact day you plan to visit. Returning donors can usually walk in, but a first visit is best booked ahead.

Your first visit

Your first visit takes about 2 hours. It includes a health questionnaire and a physical screening. Later visits typically run about 60 minutes. Grifols pays onto a prepaid debit card, usually within a few hours of you finishing. It also runs a loyalty programme, which can lift what you earn beyond the base rate.

Before you go

Drink plenty of water and eat a full meal in the few hours beforehand. Low iron and dehydration are the two most common reasons people are turned away on the day. Avoid alcohol for 24 hours and fatty food on the day itself. Hours and requirements are set locally and do change, so it is worth a quick call before you travel.

How this center compares locally

San Marcos has 2 listed plasma centers in total. At $675, the bonus reported here is the highest in the city. That is one report, not a guaranteed rate. Other companies with San Marcos locations: Spectrum Plasma.

Nearby centers

• Spectrum Plasma San Marcos, TX — 137 N Guadalupe St

Where this fits

See also all plasma centers in San Marcos, Texas directory and all Grifols locations.

Location details verified against PlasmaLedger's directory on 2026-09-01. Confirm hours with the center before travelling.