Before a patient gets a spinal/epidural, their lower back is cleaned with an antiseptic solution diluted in alcohol called ChloraPrep. ChloraPrep must completely dry before starting the anesthetic procedure. It is not known how much time is needed for the solution to completely dry. The investigators aim to determine this.

As the ChloraPrep dries, the alcohol is converted into vapour. The investigators will be using a PPBRae 3000 device to detect small amounts of vapours in the air. As the ChloraPrep dries it gives off less and less vapour. The investigators will use this diminishing vapour concentration to determine when drying is complete.

Inclusion Criteria:

• Pregnant
• At full term
• Due to have a cesarean section under spinal or epidural anesthesia
• 19 to 40 years of age

Exclusion Criteria:

• Allergy to certain antiseptic solutions
• Not suitable for a spinal/epidural anesthetic
• Have a significant amount of hair on lower back

Elective cesarean patients at BC Women's Hospital

• Small sample size
• Severe methodological assumptions (i.e. measuring of ChloraPrep drying time, lack of gold standard to assess wetness/dryness
• Patient's variables could influence wetness
• No enrollment of high BMI patients with skin folds