Fig. 2.

Blood Microsampling Techniques. Innovative methods for remote blood collection such as the Mitra Blood Collection Kit by Neoteryx (Torrance, CA, https://www.neoteryx.com/) (panels A-D) and Tasso SST OnDemand devices (Tasso, Inc., Seattle, WA, https://www.tassoinc.com/tasso-sst) (panels E-H) facilitate sampling of capillary blood from participants. (A) The Mitra™ volumetric absorbent microsampler is a polymer-based cartridge which absorbs a controlled volume of blood (up to 30 uls) of capillary blood from a finger-prick via a lancet. (B-C) The tip of the cartridge is dipped into the finger‐prick blood spot, and blood is adsorbed into the tip in a few seconds. (D) The tips are then air‐dried at room temperature. (E) The participant applies the Tasso SST OnDemand devices to their upper arm using a light adhesive. (F) The participant then presses a button that causes a vacuum to form and a lancet to prick the surface of the skin. (G) The vacuum draws blood out of the capillaries and into the sample collection tube attached to the bottom of the device. (H) The sample can then be centrifuged to obtain serum.