How to Choose Your SCIg Method for Primary Immunodeficiency
Health ConditionsRare Diseases

Choosing Your SCIg Method for Primary Immunodeficiency: Mechanical Pumps vs. Manual Push

Choosing Your SCIg Method for Primary Immunodeficiency: Mechanical Pumps vs. Manual Push
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Published on September 16, 2026
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People with certain types of primary immunodeficiency don’t make enough working antibodies to adequately fight infections.

 Immunoglobulin replacement therapy provides those missing antibodies, and subcutaneous immunoglobulin (SCIg) allows the medication to be given under the skin, usually at home.
For conventional SCIg, there are two main ways to deliver the medication: with an infusion pump that gradually moves it under the skin or by manually pushing it through a syringe.

 Both pump and manual-push SCIg provide similar protection against infections, so choosing which one is right for you comes down to personal preference.
Factors to consider include the duration and frequency of treatments, how much equipment you’re comfortable managing, and what works best for you physically.


Understanding the Basics: Mechanical Pumps vs. Manual Push

The SCIg product being infused is a concentrated solution of immunoglobulin, primarily immunoglobulin G (IgG) antibodies, made from donated human plasma. Different products come in different concentrations, so the volume needed for a prescribed dose and the time needed to infuse it can vary.

Unlike intravenous infusion which is generally administered by a healthcare professional, conventional SCIg is usually given at home by the person receiving treatment or a caregiver after appropriate training.

Taking over your own infusions can feel intimidating at first, says Rekha Raveendran, MD, an allergist and immunologist at Ohio State University's Wexner Medical Center in Columbus. Specialty-pharmacy nurses typically provide several one-on-one training sessions so people can learn the process and troubleshoot problems before infusing independently, she says.

“Most patients are comfortable infusing on their own after thorough training,” says Dr. Raveendran.

The main difference between the two methods is how the medication is delivered once the needle is placed under the skin.

Mechanical Pump For this method, you connect the immunoglobulin to tubing and the needle, and the pump delivers the medication at a prescribed rate. Pumps vary in size, capacity, power source, and how their infusion rates are controlled.

Manual Push With manual push, there’s no pump. You use your hand to steadily press the syringe plunger and deliver the immunoglobulin yourself.

Infusion Speeds and Dosing Schedules

One of the biggest considerations when deciding on manual push versus a pump is whether you’d rather have shorter treatments more often or have longer treatments less frequently.

“With the manual push, smaller volumes would be given and may have to be given more often,” says Megan Ehret, PharmD, a professor at the University of Maryland School of Pharmacy in Baltimore. With a pump, larger volumes can generally be given at once, although the infusion itself takes longer, she says.

That difference can be substantial. In one study, most manual-push infusions took 9 minutes or less, compared with a median of 49 minutes with a pump; another found median infusion times of 24 minutes with manual administration versus 60 minutes with a pump. Manual administration may require infusing on more days, depending on the dose and schedule.

However, your dose, SCIg product and concentration, number of infusion sites, amount delivered at each site, and how well you tolerate the infusion can all affect how long the infusion takes.

Mobility and Portability

For travel or a busy schedule, the important question may be whether you value less equipment or fewer treatment sessions.

Traveling with a pump can mean bringing the pump itself along with tubing, batteries, needles, and other supplies, says Ehret. Manual push eliminates much of that equipment, which can make packing and setting up an infusion simpler.

A pump may be more cumbersome to carry and take longer while it’s running, but its ability to deliver larger volumes can mean fewer administration sessions, she says. Someone else may prefer shorter manual-push infusions several times a week rather than managing pump equipment.

Physical Comfort and Other Considerations

How you physically handle the equipment and how the infusion feels at the injection site can influence which method is easier for you to live with.

Hand Strength and Dexterity

Manual push requires you to keep depressing the syringe plunger at an appropriate rate for the duration of the infusion.

“Those who have any strength or dexterity problems would have problems with the manual push, given that the push is over 10 to 15 minutes,” says Ehret. Maintaining that pressure at the correct speed for the full infusion can be difficult for some people, she says.

A pump still involves hands-on tasks such as preparing the medication, connecting tubing, and placing the needle, so dexterity matters with either method. If you have limited hand strength or dexterity, some parts of self-infusion may be difficult, and you may benefit from adaptive equipment or help from a caregiver.

Once a pump infusion begins, however, the device takes over the continuous delivery of the medication.

Local Site Comfort and Control

Redness, swelling, and sometimes bruising around an infusion site are among the most common problems with SCIg, says Raveendran. If discomfort becomes an issue, she recommends bringing it to your care team; pretreatment with an antihistamine or acetaminophen (Tylenol) may make infusions easier to tolerate.

The two delivery methods also give you different kinds of control over the infusion. With manual push, you control the syringe yourself, so you can immediately slow your push if an area starts to sting or feel uncomfortable. You can adjust the infusion rate according to your comfort and tolerability.

A pump delivers medication at a preset, steady rate. “The training nurse will assist in setting up the infusion rate,” Ehret says. If the rate is causing discomfort or other problems, she recommends working with the nurse on an adjustment rather than changing it yourself.

Neither approach consistently results in fewer local reactions; comparisons between manual push and pumps have produced mixed results.

Which One Is Right for You?

Ehret focuses on two practical questions when helping someone choose: Can you comfortably manage the method and its equipment yourself, and how do you want treatment to fit into your schedule? “Are you looking for the fastest time or the shortest number of administration sessions?” she says.

Questions to discuss with your immunologist or specialty infusion nurse include:

  • How often would I need to infuse with each method?
  • How long would a typical infusion take with my dose and SCIg product?
  • How much equipment would I need to prepare, store, and travel with?
  • Is manually pushing a syringe physically comfortable for me?
  • What should I do if the infusion rate or injection site becomes uncomfortable?
  • Can my prescribed SCIg product and dose be used with either method?

Raveendran also considers whether someone is comfortable with needles and equipment, as well as whether they can manage treatment independently or have someone at home who can help.

Keep in mind, you’re not necessarily locked into your first choice. Switching methods is an option if one approach isn’t working well, Ehret says.

Resources We Trust

EDITORIAL SOURCES
Everyday Health follows strict sourcing guidelines to ensure the accuracy of its content, outlined in our editorial policy. We use only trustworthy sources, including peer-reviewed studies, board-certified medical experts, patients with lived experience, and information from top institutions.
Resources
  1. Richter A. Current experience with manual push subcutaneous immunoglobulin (SCIg) in patients with immune deficiencies. Immunological Medicine. June 24, 2025.
  2. Immunoglobulin Replacement Therapy. Immunoglobulin Deficiency Foundation.
  3. Epland K et al. A Clinician’s Guide for Administration of High-Concentration and Facilitated Subcutaneous Immunoglobulin Replacement Therapy in Patients With Primary Immunodeficiency Diseases. Allergy, Asthma & Clinical Immunology. September 30, 2022.
  4. Rutland B et al. Comparing Setup Time and Patient Preferences for SCIg Therapy: A Head-to-Head Cross-Section Evaluation of Two SC Pumps. Future Science OA. June 18, 2025.
  5. Grosse-Kruel D et al. Infusion parameters, safety, and practical guidance for the manual administration of subcutaneous immunoglobulin 20% (Ig20Gly). Allergy, Asthma & Clinical Immunology. October 4, 2024.
  6. Rutland B et al. Patient Preferences for Faster Home-Based Subcutaneous Immunoglobulin Infusion Therapy and the Effect on Adverse Events. Patient Preference and Adherence. March 14, 2025.
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