Remote blood sampling for patients

Tilted HemaPen device with black box and grid pattern in the background.


Trajan Scientific and Medical approached us with an existing product that needed improvement. They had designed a microsampling device for healthcare professionals but wanted to expand their customer base to patients and caregivers too. We needed to understand the key steps for successful sampling and create a failproof design solution for someone taking a blood sample for the first time at-home.

Unfolded printed instructions for HemaPen device; describing five simple steps from left to right.


Depending on a person’s experience—or lack thereof—people have different techniques for collecting a blood sample. It was important that the product design addressed these differences, but it was also important that the instructions were easy to understand too.

A group of people sitting at tables with blood-sampling items aroun them. Two technicians overseeing a nurse following instructions to use the HemaPen device. Small overlapping red box on the left.
Hands using HemaPen device with dot pattern in front.


Based on our analysis and feedback from potential customers, the new hemaPEN allows a user to draw a sample from any angle and visually confirm when the sample is complete. These features create an easy-to-use device and give users the confidence they took a successful sample. We also designed and tested the Instructions for Use using large illustrations and an instructional video that focuses on the key use steps.

Nurse's hand in a medical glove (right) using HemaPen device on a patient's hand (left).

What we did

  • Product Interaction testing
  • Human Factor study
  • Instructions for Use
  • Instructional video