Since each student's accommodation needs are unique and the student is often most knowledgeable about effective accommodations, be sure to talk with the student about what accommodations he/she might need.
Some specific accommodations that might be useful to a student with disabilities that impact learning and/or attention in a science lab include the following:
- Provide a lab partner.
- Allow extra time for set up and completion of lab work.
- Use a combination of written, verbal, and pictorial instructions with scaffolding.
- Demonstrate procedures and allow students to practice.
- Build-in frequent brief breaks.
- Give preferential seating to avoid distractions and minimize extraneous stimuli.
- Allow students to use a scanning and speaking 'pen' to scan and read written materials.
This list is from the DO-IT publication Making Science Labs Accessible to Students with Disabilities .
For more examples of accommodations that can be made in science labs consult the DO-IT Knowledge Base article What are examples of accommodations in science laboratories? 
-  Making Science Labs Accessible to Students with Disabilities
-  What are examples of accommodations in science laboratories?