Micro Blood Collection

SAFE-T-FILL®  Capillary Blood Collection Systems

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Do you still scoop?

Scooping increases the risk of hemolysis, tissue contamination and clotting – it's also just plain messy. SAFE-T-FILL® collection tubes use capillary action to draw the blood into the capillary straw where it is immediately mixed with anti-coagulant. Discard the straw, pop on the attached cap, and your sample is ready for analysis.

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Working on COVID-19?

We also provide custom solutions for your diagnostic or research applications.

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SAFE-T-FILL Capillary Blood Collection Tubes

Designed to collect capillary blood samples for hematology and chemistry testing from finger or heel sticks. The attached capillary straw utilizes proprietary technology allowing the blood to be pulled into the tube through capillary action. 

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SAFE-T-FILL Blood Gas Capillaries

SAFE-T-FILL Blood Gas Capillaries provide the same capillary action as glass without the associated risks. Used with heel or finger sticks, direct from a catheter, or as a transfer device, our capillary tubes offer a safer alternative to glass or Mylar®-coated glass capillary tubes.

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SAFE-T-FILL Microhematocrits

SAFE-T-FILL Micro Hematocrit tubes are 100% plastic to ensure safe and accurate micro hematocrit determinations. Designed with the same capillary action properties as glass, our micro hematocrit tubes fill quickly without the risk of breakage.


Available from Major Distributors

(and many others)



About RAM Scientific

RAM Scientific, now a part of ASP Global, has been providing high quality 100% plastic capillary blood collection devices since 1989. Recognized as the premiere source of safe micro blood collection systems for clinical and research applications, RAM is dedicated to laboratory safety through the replacement of glass with plastic.

The SAFE-T-FILL® product line's proprietary technology allows plastic tubes to have the same capillary action as glass tubes without the risks associated with glass. Currently SAFE-T-FILL Capillary Blood Collection Tubes, Blood Gas Capillary Tubes, and Micro Hematocrit Tubes are available in a variety of sizes and additives for a wide range of applications. They are available through all major distributors. SAFE-T-FILL products can also be customized to suit individual requirements.